1.

On a 100 km straight road, a car travels the first half at auniform speed of 30 km h'. How fast must the car travelfor the next half so that the average speed of 45 km hisattained for the journey?​

Answer»

ANSWER:

in first half

d=50km

s=30kmph

TIME=(50/30)hr=1.66hr

Explanation:

total DIST

=100km

and ave speed

=45kmph=(total dist)/(total time)

=100/t

so

t=100/45

=2.22hr

which means

second LEG of 50km

was DONE in 2.22-1.66

=0.56 hr

so speed was

50/0.56

=89.28 kmph ANSWER



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